Brief thread hijack:
Going 12/12 from seed is, in essence, pretending the plant is an auto: you're goal is to finish as quickly as possible, and you get what you get. Furthermore, if you go this route with regular beans, 50% of those plants are going to be throw-away males. I have no idea how large the plant would be when it starts to flower (and that probably depends a lot on genetics), but it could be difficult to clone (and the longer the plant flowers, the harder it is to clone). So, once you're done with those plants, those genes go bye-bye.
If you veg to maturity, you'll almost certainly see pre-flowers before you switch to 12/12, and now you know which ones deserve your undivided love and attention. You can turn that plant into a mum, chop of a clone or two or 10, and do whatever you want. If you like the smoke, congrats: you've got a mum and you can grow it again for as long as you've got the mum.
... and to get closer to on topic:
When I grew Bogglegum, I think I veg'd for 6-8 weeks (though probably underfed them). Would do 1 plant in a 3x3 space under 400W HPS in a 5-gallon pot. In 4x4, you could probably do 4 plants in 5-gallon pots (what I do now ), or go bigger/smaller. I seem to recall it being a well-behaved indica, so SOG would be reasonable if you want lots of shorty plants.